最近需要在HTML的内容中提取一段文本作为简介,如果用普通的办法提取那么将有可能出现截取了半个HTML标志的情况,会破坏页面布局, 为此添加了这么一个函数,可完美解决此问题!!注意在这里你截取的字符数是不含HTML标志的!!- <?php
" e: c. f. f n; K1 u. b/ G - /** 1 E" P1 }) ]! T* ^; a$ |, ~7 F+ t
- * 截取HTML字符串 允许忽略HTML标志不计 1 U% p; t: h! F* ~. T1 f; r
- *
3 f! L1 ?6 M& p7 A$ B - * Author:学无止境
) c' @$ k1 O! W) _ x - * Email:xjtdy888@163.com
4 S" g# M# A1 v8 N - * QQ: 339534039 3 X* z; O; F/ Y, s& x
- * Home:http://www.phpos.org
2 ^( ^2 T o% u8 N - * Blog:http://hi.baidu.com/phps
% C8 s$ P" N; j; V - * r+ c. ~( T" B7 q
- * 转载请保留作者信息 4 F. |& @, k2 x
-
! _8 e% O( ^9 {$ P `5 ]: J2 H2 S0 s - * 7 a0 r! H( ?2 c0 Y6 p
- * @param 要截取的HTML $str
$ L/ i& ~ |) Y - * @param 截取的数量 $num 5 H2 J/ M3 d. @7 y' I
- * @param 是否需要加上更多 $more
. E6 N" b) R, ? M* t6 d. X - * @return 截取串
: G' c# b \- e1 M* s" D - */ ; a) g6 X, A. o4 U$ h$ P
- function phpos_chsubstr_ahtml($str,$num,$more=false) ' c3 {5 ?* m+ b6 _$ u' V) c# g, t
- { ) l* \; W! y. ?! N6 Z
- $leng=strlen($str);
l1 H( T5 @7 k6 P - if($num>=$leng) return $str;
0 y& K" S$ B# J9 P - $word=0;
8 K3 d5 B- F# C2 s$ b - $i=0; /** 字符串指针 **/
/ ~2 T- w" p! m, U8 Q0 S4 O - $stag=array(array()); /** 存放开始HTML的标志 **/ 0 Z/ }. Y7 a- k) f9 N* b
- $etag=array(array()); /** 存放结束HTML的标志 **/
& H( G% \0 }% h/ p" c" i* h - $sp = 0;
2 j7 L& d) s& u/ a - $ep = 0; . Q, z) Y# C. \3 R' Y" [ [
- while($word!=$num)
' w1 G3 s4 Q% _; |4 ^& t: g - { ; g# O9 d4 e+ Q( o
-
. `* U, ]5 [" S4 V' m- C- [ D - if(ord($str[$i])>128) 2 z- V% q3 C! r, e
- {
4 {! |5 ?& A2 _ x6 i - //$re.=substr($str,$i,3); ' ?* T, q) j3 `2 c
- $i+=3;
; C5 Y' Z2 l0 x, H4 G2 k' S5 }* X* J - $word++; 8 p4 z( k# @: a
- }
/ b, X: ^' k% n - else if ($str[$i]=='<') & c+ Y; y# j6 s7 D
- { . x9 ?6 J) R8 H) N5 D
- if ($str[$i+1] == '!')
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- $i++;
: F4 ~3 C$ B$ }7 A: U4 e q: m - continue;
: E6 F1 R p+ _, q5 ^/ E0 ] - }
- [2 o8 c! N- W% Z4 x - 5 J% \& ?# X2 U' I0 [9 t
- if ($str[$i+1]=='/') ; y+ {& m. ^* v2 \7 q) \* {: t
- {
$ C! U' }9 E9 E3 h - $ptag=$etag ; ) \) a( e2 M7 a9 }
- $k=$ep; 6 z* |+ L G! g& k) u$ w
- $i+=2; b" X& ]6 ^% ?. m! `# ?
- } : m% }% H5 t5 e' ?. Z1 C5 B
- else
4 h( G. H5 B, g# ?2 o+ L S - { 2 }1 c3 F* K/ p" M! u
- $ptag=$stag; 6 s0 L( h( V+ R! O
- $i+=1; ' B; z4 \/ g/ Y) z+ U6 v" e: g
- $k=$sp; 6 w7 \1 a5 f' W' a
- } / x5 [0 @8 `5 {1 g% {& R5 k
-
5 c6 w3 v: K; v - for(;$i<$leng;$i++) 7 O+ e& F9 T/ i% D
- { - j O4 r; H9 ~; _
- if ($str[$i] == ' ')
! S* w; @/ _6 I7 k4 h7 x - {
. M& V0 G/ w" q5 k1 v F - $ptag[$k] = implode('',$ptag[$k]); c" ^# O7 q) `" F5 S+ i* n) B6 x
- $k++;
3 @' V2 ` U C9 e5 n - break;
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- if ($str[$i] != '>') 8 t% x6 h8 c3 X; `/ ]$ G1 Y6 N7 {
- { % w* w1 m; v! S6 G. _' c
- $ptag[$k][]=$str[$i]; % U @0 E$ H/ @. S$ {
- continue; 3 ^7 D A; {! c8 R2 H% _
- }
7 N# m9 J5 s0 @7 H. Z - else , s- ^$ Q! u; n
- { 2 k" _% R4 A& ^3 g" @
- $ptag[$k] = implode('',$ptag[$k]);
1 }6 }; } p) |1 _ W5 W! z - $k++; ) K$ _9 z6 m0 [1 ]) ]
- break; 4 T* b" ]3 W" E6 z- P i7 [
- }
& }7 e) x2 F6 U: Z4 _ - }
; q% R" ^- y# j - $i++;
7 o$ `) x3 I4 I/ q* Y: f' z+ ? - continue; 8 Z4 d5 Y* f$ I8 u6 N
- }
1 Y0 a( \7 n' `# H - else ( b' {- U" y; F0 B8 \
- { $ i& n, x6 {8 h8 L) E M/ u
- //$re.=substr($str,$i,1); 3 J6 C \9 L9 \( | ?3 m" j
- $word++;
) S0 [2 g) n! e; h% J - $i++; : A; a% n/ a8 [3 {. S
- } # G$ v5 _; p* x1 t8 t9 K' }9 f
- } " }( C; O: f) J1 g# H+ |
- foreach ($etag as $val)
* q+ h3 r# k' E& D& x! L - { 4 p. P7 s6 Z" M0 k$ ?0 Z
- $key1=array_search($val,$stag);
8 z( ], X! d; w - if ($key1 !== false) unset($stag[$key]); 9 S! |9 {3 k4 X+ U& q/ f
- }
" T$ E& |- a/ G6 t8 l+ l2 c - foreach ($stag as $key => $val) $ w ?6 e: c/ W
- { 0 a. X+ E9 n, U/ a. k2 m% C
- if (in_array($val,array('br','img'))) unset($stag[$key1]); & H7 x, I$ }% x* \( }& V0 K
- }
8 G( q5 o0 F( x' N6 T* S, t - array_reverse($stag);
- W+ Z) J% e6 r2 n* { - $ends = '</'.implode('></',$stag).'>';
1 I$ r" f% [7 ^0 G6 s - $re = substr($str,0,$i).$ends;
" j2 k4 h. I g1 Z+ c - if($more) $re.='...'; ; z4 u2 o/ x* y1 i) e
- return $re;
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- 5 f0 W. I3 g* `) X
- $str=<<<EOF k. C% Y2 p4 [& ?/ D @/ k
- <h3>What is the <acronym>GNU</acronym> pr<a><a><a>oject?</h3> 9 ?' z+ Z- S4 K1 J# y* P* l
- <p>The <acronym>GNU</acronym> Project was launched in 1984 to develop a complete Unix-like operating system which is <a href="http://www.gnu.org/philosophy/free-sw.html">free software</a>: the <acronym>GNU</acronym> system. Variants of the <acronym>GNU</acronym> operating system, which use the kernel called Linux, are now widely used; though these systems are often referred to as “Linux”, they are more accurately called <a href="http://www.gnu.org/gnu/linux-and-gnu.html">GNU/Linux systems</a>. </p> ' c- Y8 H9 s8 ?8 g7 K- Q- w& R
- <p><acronym>GNU</acronym> is a recursive acronym for “GNU's Not Unix”; it is pronounced <em>guh-noo</em>, approximately like <em>canoe</em>.</p> * U' X# g k. v% W$ d/ w) O% K0 o
- <h3>What is Free Software?</h3> C9 h' l6 [: u$ l [! c
- <p>“<a href="http://www.gnu.org/philosophy/free-sw.html">Free software</a>” is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech”, not as in “free beer”.</p> 5 Z5 {. ~1 g8 L# W/ E4 [3 s& I' ^
- <p>Free software is a matter of the users' freedom to run, copy, distribute, study, change and improve the software. More precisely, it refers to four kinds of freedom, for the users of the software:</p>
) X) t/ B$ b9 i/ L, g - <ul> ( Y7 G$ K8 W c
- <li>The freedom to run the program, for any purpose (freedom 0). </li>
- C. X1 c1 C7 }1 G& U4 e - <li>The freedom to study how the program works, and adapt it to your needs (freedom 1). Access to the source code is a precondition for this. </li>
/ q$ w0 K) i9 H" \' ` - <li>The freedom to redistribute copies so you can help your neighbor (freedom 2). </li> ; R, z8 U+ c% B+ y( {& l8 G
- <li>The freedom to improve the program, and release your improvements to the public, so that the whole community benefits (freedom 3). Access to the source code is a precondition for this. </li> $ y* b& k8 J) p( T
- </ul>
! r2 B4 a1 t% t& t" Z - <h3>What is the Free Software Foundation?</h3> & I7 H& M4 F( Q2 a
- <p>The <a href="http://www.fsf.org/">Free Software Foundation</a> (<abbr title="Free Software Foundation">) is the principal organizational sponsor of the Project. The receives very little funding from corporations or grant-making foundations, but relies on support from individuals like you. </abbr>) is the principal organizational sponsor of the Project. The receives very little funding from corporations or grant-making foundations, but relies on support from individuals like you. </p>
- i& h- P: @$ j: s - <p>Please consider helping the <abbr>by , or by . If you use Free Software in your business, you can also consider or as a way to support the . </abbr>by , or by . If you use Free Software in your business, you can also consider or as a way to support the . </p>
' g8 d, h; J1 V - <p>The <acronym>GNU</acronym> project supports the mission of the <abbr>to preserve, protect and promote the freedom to use, study, copy, modify, and redistribute computer software, and to defend the rights of Free Software users. We support the on the Internet, , and the unimpeded by private monopolies. You can also learn more about these issues in the book . </abbr>to preserve, protect and promote the freedom to use, study, copy, modify, and redistribute computer software, and to defend the rights of Free Software users. We support the on the Internet, , and the unimpeded by private monopolies. You can also learn more about these issues in the book . </p> + s6 u0 I2 `5 ^/ U$ i5 b
- <!-- & j. }8 f- ^$ H
- Keep link lines at 72 characters or lynx will break them poorly
# y9 _7 @0 i( f - Obviously, we list ONLY the most useful/important URLs here # ?2 y% j) s. X9 @9 p
- Keep it short and sweet: 3 lines and 2 columns is already enough
/ {$ E2 R. I$ F0 ]. Z) C - --><!-- BEGIN GNUmenu --> $ D. z' l5 q' j: F; [8 q: M( C% S1 T
- EOF;
7 ^: r7 c& O: s: S - echo phpos_chsubstr_ahtml($str,800); ' f, k" T# |2 _
- ?> - i( |& g8 C/ R& a$ U
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